/Engine/Source/Runtime/AssetRegistry/Public/AssetRegistry/AssetRegistryState.h
Returns the first LongPackageName found for the given PackageName. Issues a warning and returns the first (sorted lexically) if there is more than one. Call to check existence of a LongPackageName or find a package with a ShortPackageName.
The first LongPackageName of the matching package, or NAME_None if not found.
[FName](API\Runtime\Core\UObject\FName) GetFirstPackageByName ( FStringView PackageName ) const